Now that conservation is a word in everyday use, we have the second and more difficult task of explaining what it really means, and a filmstrip such as Dr. D.H. Dalby’s Nature Conservation in the British Isles makes a valuable contribution. His photographs are unemotional statements of fact and the lecture notes full and informative, with background information in italics. The filmstrip is divided into three sections with inevitably some overlap between them. The first ‘Some major threats’ has twelve frames ‘ it seems a pity there was not room for more about such farming techniques as removal of hedges and the effects of coastal development; the second ‘How natural are our habitats?’ discusses the evolution of our countryside and provokes the question, What is it we are trying to conserve? The third is concerned with conservation measures. Aimed principally at secondary schools, naturalists’ trusts and amenity bodies, there is, surprisingly, no mention of Colleges of Education or Teachers’ Centres. The education of future generations of adults is fundamental in conservation, but first we must educate our teachers.